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That's an interesting looking pulley. As far as wiring you would need a model # to track down a wiring diagram, or someone who knows generators/motors well enough to figure out what wire does what with a meter.

If it came with a Start-O-Matic set it may have a generator winding and a DC starting/charging winding as well. How about a picture of the wires and terminals from above. That may help. Pictures of the switchboard may offer some clues as well.

This appears to be a DC generator as it has a commutator rather than slip rings. These were very common in garages in the late 1800 /early 1900s when batteries were used to run tramcars and old valve radio equipment.... charging stations were everywhere. AC mains required high current rectifying equipment, it was easier and cheaper to use DC generators driven from either an AC motor, or a stationary engine to get low voltage DC..... thats my guess.It could also be a DC welder, although the wire size suggests otherwise.

Looking more closely, Id say its a compounded DC generator. the output current will be found across the two green wires inside the unit. The brushes appear to be seriesed with part of the field coils (stator) giving feedback to hold the voltage stable under load. The exciter current is fed into the two black wires.Chuck it in a lathe and spin it up with a DC voltmeter across the green wires, and feed in a small current from say a car battery into the two blacks. It will generate, and measurements can be taken to identify is parameters. Another guess ... its a 120 volt DC unit at around 20 amps.... judging by the winding sizes, probably needs around 15 volts at 2 amps exciter current.....